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Defrost control method of air source heat pump system

An air source heat pump and control method technology, applied in the field of heat pumps, air conditioning and refrigeration, can solve the problems of lowering the overall energy efficiency of heat pumps, no frost, wrong defrosting, and excessive power consumption, so as to avoid fluctuations in water temperature and room temperature, and solve the problem of no frost The effect of mistakenly defrosting and saving defrosting energy consumption

Active Publication Date: 2018-11-02
TONGFANG ARTIFICIAL ENVIRONMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1) The heating of the unit is suspended during defrosting, and the reverse defrosting will also take heat from the evaporator, resulting in a drop in water temperature and room temperature, affecting indoor temperature control
[0004] 2) The defrosting process consumes more electric energy, which reduces the overall energy efficiency of the heat pump
[0005] 3) During the defrosting process, valve switching, fluid reversal, and drastic changes in system pressure and temperature all cause impacts on various components of the system, and are not conducive to the normal oil return of the compressor, shortening the overall life of the unit
It also creates additional noise, exacerbating the noise problem with air source heat pumps
[0006] 4) Due to the variable outdoor environment and building load, uneven frosting, sensor interference and other factors, the current air source heat pump defrosting technology level cannot fully achieve accurate defrosting
As a result, it is very common for air source heat pumps to defrost without frost, which exacerbates the aforementioned three problems.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] 1) Implementation Mode 1

[0027] An air source heat pump air conditioning system has a total of n air source heat pump units running in parallel. When a certain unit (named as unit a) reaches the defrosting condition, it is marked as "waiting for defrosting". At this time, if all other n-1 units are in normal heating or in defrosting mode, unit a will enter normal defrosting mode. Frost mode (reverse or hot gas bypass defrosting), restart the heating operation after defrosting, and remove the "defrosting" status.

[0028] 2) Implementation Mode 2

[0029] An air source heat pump air conditioning system has a total of n air source heat pump units running in parallel. When a unit (named as unit a) reaches the defrosting condition, it is marked as "to be defrosted". At this time, there is only one unit (named unit b) in standby mode, and the status of unit b is not "waiting for defrosting". Then the previous standby of unit b was not caused by reaching the defrosting ...

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PUM

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Abstract

The invention relates to a defrost control method of an air source heat pump system, and relates to the technical field of air conditioning refrigeration and heat pumps. The defrost control method comprises the steps of when a system runs and one unit reaches to a defrost condition, naming the unit as a unit a, and carrying out the following judgment: (i) when no unit is at a standby mode, enabling the unit a to enter a normal defrost mode; (ii) when the other unit is at a standby mode, naming the unit as a unit b; if the state of the unit b is not 'to be defrosted', closing the unit a, enabling the unit a to enter the standby mode, and meanwhile, enabling the unit b to start heating for running; and otherwise, keeping the unit a to be at a heating mode, and then carrying out correspondingcontrol; and (iii) when two and more that two units are at the standby mode, judging and selecting the units, naming the selected units as units b, and carrying out follow-up control according to thestep as shown in (ii). The method provided by the invention can be used for carrying out defrost control on a multiple air source heat pump unit combined operation system, and effectively solves various problems caused by defrosting of a current air source heat pump system through adjusting a defrost control logic.

Description

technical field [0001] The invention relates to the technical fields of air-conditioning refrigeration and heat pumps, in particular to a defrosting control method for an air source heat pump system. Background technique [0002] With the promotion of a series of policies such as energy saving, emission reduction, and atmospheric governance, air source heat pumps have gradually been recognized as a clean and energy-saving heating method, and have achieved considerable development in recent years. Defrost has always been one of the key technologies of air source heat pumps, and it is also a difficulty that hinders the performance improvement of air source heat pumps and restricts its promotion. In the prior art, the mainstream defrosting methods of air source heat pump units include reverse defrosting and hot gas bypass defrosting. During the heating operation of the unit, when the detection reaches the defrosting condition, it will enter the defrosting mode, and turn on the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B47/02
CPCF25B47/02F25B2700/11
Inventor 韩林俊
Owner TONGFANG ARTIFICIAL ENVIRONMENT
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